That's generally the response. My thought is: then how do you know when someone is just wrong? Why do teachers have red pens? While in aggregate, I suppose toda

That's generally the response. My thought is: then how do you know when someone is just wrong? Why do teachers have red pens? While in aggregate, I suppose today's mistakes are tomorrow's standard usage, but individual acts may simply mean somebody doesn't have the best way of saying what they're trying to communicate.